Bonjour
A = 1/5 + 7/20
A = (1 x 4) / (5 x 4) + 7/20
A = 4/20 + 7/20
A = 11/20
B = 7/6 + 2/30
B = (7x 5) / (6 x 5) + 2/30
B = 35/30 + 2/30
B = 37/30
C = - 2/3 + 7/33
C = (- 2 x 11) / (3 x 11) + 7/33
C = - 22/33 + 7/33
C = - 15/33
C = (3 x - 5) / (3 x 11)
C = - 5/11.
D = 7/12 + 5/4
D = 7/12 + (5 x 3) / (4 x 3)
D = 7/12 + 15/12
D = 22/12
D = (2 x 11) / (2 x 6)
D = 11/6
E = - 7/40 + 3/4
E = - 7/40 + (3x 10) / (4 x 10)
E = - 7/40 + 30/40
E = 23/40
F = 9/28 + 3/4
F = 9/28 + (3 x 7) / (4 x 7)
F = 9/28 + 21/28
D = 30/28
D = (2 x 15) / (2 x 14)
D = 15/14.
